J. Barth et al., SERUM 25(OH)D(3) AND ULTRAVIOLET EXPOSURE OF RESIDENTS IN AN OLD PEOPLES HOME IN GERMANY, Photodermatology, photoimmunology & photomedicine, 9(5), 1993, pp. 229-231
The 25(OH)D3 serum levels of 31 and 29 residents of an old people's ho
me in Dresden were determined in February and in August 1991. The mean
25(OH)D3 levels in winter were below 10 ng/ml. Bedridden patients did
not reach this level even in summer. Polysulphone films are useful in
dicators of a deficiency of ultraviolet light, which can result in a s
ubsequent vitamin D deficiency.